Merge branch 'mailbox-linux-4.1.y' of git://git.ti.com/rpmsg/mailbox into rproc-linux-4.1.y

Pull in the updated mailbox feature branch into the remoteproc tree,
this includes the suspend/resume support in the OMAP mailbox driver.

* 'mailbox-linux-4.1.y' of git://git.ti.com/rpmsg/mailbox

:
  mailbox/omap: check for any unread messages during suspend
  mailbox/omap: add support for suspend/resume
  mailbox/omap: store mailbox interrupt type in omap_mbox_device

Signed-off-by: Suman Anna <s-anna@ti.com>